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JavaRunner
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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>JavaRunner — Learn Java Online for Mobile & Desktop</title>
  <meta name="description" content="JavaRunner is a mobile and desktop-friendly interactive Java IDE for beginners. Learn Java safely on your device with auto-formatting, run code, and save files locally.">
  <meta name="keywords" content="Java IDE, Learn Java, Online Java Compiler, JavaRunner, Coding for Beginners, Ragini Didi">
  <meta name="author" content="JavaRunner Team">
  
  <!-- OpenGraph / LLM friendly -->
  <meta property="og:title" content="JavaRunner — Learn Java Online"/>
  <meta property="og:description" content="Interactive Java IDE for mobile and desktop. Write, run, save Java code locally. Perfect for beginners and students."/>
  <meta property="og:type" content="website"/>
  
  <!-- Font -->
  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700&display=swap" rel="stylesheet">
  
  <!-- FontAwesome Icons -->
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.0/css/all.min.css" integrity="sha512-t9f6b..." crossorigin="anonymous" referrerpolicy="no-referrer" />

  <!-- CodeMirror -->
  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/codemirror.min.css">
  <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/codemirror.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/mode/clike/clike.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/addon/edit/closebrackets.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/addon/edit/matchbrackets.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/codemirror/5.65.13/addon/edit/indentation.min.js"></script>

  <style>
    :root{
      --bg: #0f1720;
      --glass: rgba(255,255,255,0.05);
      --glass-dark: rgba(0,0,0,0.35);
      --accent: #6c8cff;
      --accent-light: #8be5d0;
      --muted: #9aa4b2;
      --card-shadow: 0 8px 30px rgba(2,6,23,0.6);
      --radius: 16px;
    }

    *{box-sizing:border-box;}
    html, body{margin:0;padding:0;font-family:Inter,sans-serif;background: linear-gradient(180deg,#071227 0%,#0d1a2b 100%); color:#e6eef8;}
    body{min-height:100vh; display:flex; flex-direction:column; align-items:center; padding:12px;}

    h1,h2,h3,h4,h5,h6{margin:0;}
    
    .app {
      display:grid;
      grid-template-columns: 280px 1fr;
      gap:16px;
      width:100%;
      max-width:1200px;
      margin:0 auto;
      flex:1 1 auto;
    }

    /* Glass morph panel */
    .panel {
      background: var(--glass);
      backdrop-filter: blur(10px) saturate(1.05);
      border-radius: var(--radius);
      border:1px solid rgba(255,255,255,0.08);
      padding:14px;
      display:flex;
      flex-direction:column;
      gap:12px;
      box-shadow: var(--card-shadow);
      transition: all 0.2s ease;
    }
    .panel:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(8,14,40,0.6); }

    /* File sidebar */
    .files {
      display:flex;
      flex-direction:column;
      gap:12px;
      min-height:200px;
    }
    .files .top { display:flex; justify-content:space-between; align-items:center; gap:8px; }
    .brand { font-size:18px; font-weight:700; color: var(--accent); display:flex; align-items:center; gap:8px; }
    .brand i{font-size:20px; transform:translateY(-1px);}
    .file-list { display:flex; flex-direction:column; gap:6px; overflow:auto; max-height:calc(100vh - 220px); }

    .file-item {
      padding:8px; border-radius:12px; display:flex; justify-content:space-between; align-items:center; cursor:pointer; background: rgba(255,255,255,0.02);
      transition: all .14s ease;
    }
    .file-item:hover{background: rgba(108,140,255,0.1);}
    .file-item.active{background: rgba(108,140,255,0.12); color:#fff;}

    /* Editor area */
    .editor-area{display:flex; flex-direction:column; gap:10px;}
    .topbar{display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap;}
    .title{font-size:14px;color:var(--muted);}
    .controls{display:flex; gap:6px; flex-wrap:wrap; margin-top:6px;}

    .btn{
      padding:8px 10px; border-radius:12px; border:none; cursor:pointer; font-weight:600; display:inline-flex; align-items:center; gap:6px;
      transition: all 0.15s ease; background: linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01)); color:var(--muted);
    }
    .btn:hover{transform:translateY(-2px);color:#fff;box-shadow:0 6px 16px rgba(0,0,0,0.35);}
    .primary{background: linear-gradient(90deg,var(--accent), var(--accent-light)); color:#04253b; font-weight:700;}
    .secondary{background:transparent; border:1px solid rgba(255,255,255,0.05); color:var(--muted);}

    .cm-wrap{border-radius:14px; overflow:hidden; border:1px solid rgba(255,255,255,0.02);}
    .CodeMirror{height:calc(100vh - 400px); background: var(--glass-dark); color:#e8f1ff; font-size:13px;}
    .console{background: rgba(0,0,0,0.4); border-radius:12px; padding:10px; font-family:monospace; color:#cfe7ff; max-height:160px; overflow:auto; border:1px solid rgba(255,255,255,0.04);}

    footer{text-align:center; font-size:13px; color:var(--muted); margin-top:14px;}
    .note{color:#c7d7ff; font-weight:600;}

    /* Responsive */
    @media(max-width:1000px){.app{grid-template-columns:1fr;}}
    @media(max-width:600px){.CodeMirror{height:calc(100vh - 380px); font-size:12px;}}
    @media(max-width:400px){.topbar{flex-direction:column; align-items:flex-start;} .controls{flex-wrap:wrap;}}
  </style>
</head>
<body>

  <div class="app">
    <!-- File sidebar -->
    <div class="panel files" id="sidebar">
      <div class="top">
        <div class="brand"><i class="fa-solid fa-rocket"></i> JavaRunner</div>
        <div>
          <button class="btn" id="newBtn" title="New file"><i class="fa-solid fa-file-circle-plus"></i></button>
        </div>
      </div>

      <div class="file-list" id="fileList"></div>
    </div>

    <!-- Editor area -->
    <div class="panel editor-area">
      <div class="topbar">
        <div class="title">Interactive Java IDE — Mobile & Desktop Friendly</div>
        <div class="controls">
          <button class="btn primary" id="runBtn"><i class="fa-solid fa-play"></i> Run</button>
          <button class="btn secondary" id="saveBtn"><i class="fa-solid fa-floppy-disk"></i> Save</button>
          <button class="btn secondary" id="downloadBtn"><i class="fa-solid fa-download"></i> Download</button>
          <button class="btn secondary" id="formatBtn"><i class="fa-solid fa-align-left"></i> Format</button>
          <button class="btn secondary" id="deleteBtn"><i class="fa-solid fa-trash"></i> Delete</button>
        </div>
      </div>
      <div class="cm-wrap" id="cmWrap">
        <div id="editor"></div>
      </div>
      <div class="console" id="console">Console output will appear here.</div>
    </div>
  </div>

  <footer>
    Made with love for <span class="note">Ragini Didi 💖</span> — Happy Java Learning!
  </footer>

  <script>
    // ---------- CodeMirror ----------
    const editor = CodeMirror(document.getElementById('editor'), {
      mode:"text/x-java",
      lineNumbers:true,
      tabSize:4,
      indentUnit:4,
      autoCloseBrackets:true,
      matchBrackets:true,
      theme:"default",
      value:`class Main {
    public static void main(String[] args) {
        System.out.println("Hello Ragini Didi! Welcome to JavaRunner");
    }
}`
    });

    function resizeEditor(){ editor.setSize('100%', window.innerHeight-400); }
    window.addEventListener('resize',resizeEditor);
    setTimeout(resizeEditor,200);

    // Local file storage
    let files = JSON.parse(localStorage.getItem('java_runner_files')||'{}');
    let active = localStorage.getItem('java_runner_active') || null;
    const fileListEl = document.getElementById('fileList');
    const consoleEl = document.getElementById('console');

    function saveToStorage(){ localStorage.setItem('java_runner_files',JSON.stringify(files)); }
    function setActive(name){ active=name; localStorage.setItem('java_runner_active',active); renderFiles(); editor.setValue(files[active]); }
    function renderFiles(){ fileListEl.innerHTML=''; Object.keys(files).forEach(f=>{const div=document.createElement('div');div.className='file-item'+(f===active?' active':''); div.innerText=f; div.onclick=()=>setActive(f); fileListEl.appendChild(div); }); }

    function newFile(){ const name='Main.java'; if(files[name]) { alert('File exists'); return;} files[name]=editor.getValue(); saveToStorage(); setActive(name);}
    function saveFile(){ if(!active)return; files[active]=editor.getValue(); saveToStorage(); consoleEl.innerText='Saved locally ✔';}
    function downloadFile(){ if(!active)return; const blob=new Blob([editor.getValue()],{type:'text/plain'}); const a=document.createElement('a'); a.href=URL.createObjectURL(blob); a.download=active; a.click(); URL.revokeObjectURL(a.href);}
    function deleteFile(){ if(!active) return; if(confirm(`Delete ${active}?`)){ delete files[active]; saveToStorage(); active=null; editor.setValue(''); renderFiles(); }}

    document.getElementById('newBtn').onclick=newFile;
    document.getElementById('saveBtn').onclick=saveFile;
    document.getElementById('downloadBtn').onclick=downloadFile;
    document.getElementById('deleteBtn').onclick=deleteFile;

    document.getElementById('formatBtn').onclick=()=>{ editor.execCommand('selectAll'); editor.execCommand('indentAuto'); editor.execCommand('singleSelection');};

    document.getElementById('runBtn').onclick=async()=>{
      if(!active) return; saveFile(); consoleEl.innerText='Running...';
      try{
        const resp=await fetch('/run-java',{method:'POST', headers:{'Content-Type':'application/json'}, body: JSON.stringify({code: editor.getValue(), filename: active})});
        const data=await resp.json();
        consoleEl.innerText=data.output||data.error||'No output';
      }catch(e){ consoleEl.innerText='Error: '+e.message; }
    };

    if(Object.keys(files).length===0) newFile(); else setActive(Object.keys(files)[0]);
  </script>
</body>
</html>